Thomas G Wilkinson

US Patent:

51440695, Sep 1, 1992

Filed:

Dec 13, 1990

Appl. No.:

7/626739

Inventors:

Richard M. Stern - Woodbury MN
Richard A. Guenthner - White Bear Lake MN
Roger R. Alm - Lake Elmo MN
Thomas K. Wilkinson - Woodbury MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

C07C31500

US Classification:

562556

Abstract:

A process for the synthesis of the fluorochemical compound having formula R. sub. f SO. sub. 2 N(CHR. sup. 2 --CHR. sup. 2 COO. sup. -) R. sup. 1 N. sup. + (R). sub. 2 H wherein R. sub. f is a fluoraliphatic radical containing at least 3 carbon atoms. The synthesis involves reaction of compounds of formula R. sub. f SO. sub. 2 N(H)R. sup. 1 N(R). sub. 2 and CHR. sup. 2. dbd. CH. sup. 2 COOH in solution at elevated temperatures. The process can be used to synthesize the fluoroaliphatic amphoteric amino carboxylate surfactant having the formula: C. sub. 6 F. sub. 13 SO. sub. 2 N(C. sub. 2 H. sub. 4 COO. sup. -) C. sub. 3 H. sub. 6 N. sup. + (CH. sub. 3). sub. 2 H which compound is useful in aqueous film-forming foamable concentrates for extinguishing flammable liquid fires.